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STOCK-BASED COMPENSATION - Narratives (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Oct. 31, 2024 | Sep. 30, 2024 | Nov. 30, 2023 | Mar. 31, 2011 | Dec. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 03, 2019 | Sep. 30, 2019 | Oct. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash stock and deferred compensation expense |  |  |  |  |  | $ 188,000,000 | $ 135,000,000 | $ 153,000,000 |  |  |
Stock option weighted-average grant date fair value |  |  |  |  |  | $ 397.31 | $ 251.73 | $ 254.21 |  |  |
Unrecognized compensation cost related to non-vested awards expected to vest |  | $ 245,000,000 |  |  |  | $ 245,000,000 |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Fair value of options vested |  |  |  |  |  | $ 97,000,000 | $ 80,000,000 | $ 88,000,000 |  |  |
Dividend equivalent payments, current (Note 16) |  | 180,000,000 |  |  |  | 180,000,000 | 19,000,000 |  |  |  |
Dividend Equivalent Payments on Certain Stock Options, Non-current |  | $ 47,000,000 |  |  |  | 47,000,000 |  |  |  |  |
Share-Based Payment Arrangement, Tax Benefit |  |  |  |  |  | 24,000,000 | 15,000,000 | 18,000,000 |  |  |
Share-Based Payment Arrangement, Noncurrent Liabilities, Other |  |  |  |  |  | 102,000,000 | 48,000,000 |  |  |  |
Dividend Equivalent Payments |  |  |  |  |  | $ 233,000,000 | $ 38,000,000 | $ 86,000,000 |  |  |
Dividends declared (in usd per share) |  | $ 75.00 | $ 35.00 |  |  | $ 110.00 | $ 0 | $ 18.50 |  |  |
Dividends |  |  |  |  | $ 1,937,000,000 | $ 6,153,000,000 |  |  |  |  |
Dividends Payable |  | $ 4,216,000,000 |  |  |  | 4,216,000,000 |  |  |  |  |
Other Non-Current Liabilities |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash stock and deferred compensation expense |  |  |  |  |  | 54,000,000 | $ 23,000,000 | $ 2,000,000 |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash stock and deferred compensation expense |  |  |  |  |  | $ 134,000,000 | 112,000,000 | 151,000,000 |  |  |
2019 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | 4,000,000 |  |
Shares available for award |  |  |  |  |  | 3,435,370 |  |  |  |  |
2014 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | 5,000,000
2006 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 8,119,668 |  |  |  |  |  |  |
Restricted stock grant period in years |  |  |  | 3 years |  |  |  |  |  |  |
2003 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  | $ 794,000,000 | $ 500,000,000 | $ 279,000,000 |  |  |
S 2025 Q1 Dividends | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 4,216,000,000 |  |  |  |  |  |  |  |  |  |
DE 2025 Q1 Dividends | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 132,000,000 |  |  |  |  |  |  |  |  |  |
Performance Vested Stock Options | 2019 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for award |  |  |  |  |  | 398,729 |  |  |  |  |
Stock-based compensation activity (in shares) |  |  |  |  |  | 3,521 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercised |  |  |  |  |  | $ 631.12 |  |  |  |  |
Number of Options Exercisable at end of period |  | 120,116 |  |  |  | 120,116 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercisable |  | $ 712.29 |  |  |  | $ 712.29 |  |  |  |  |
Weighted-Average Remaining Contractual Term, Exercisable, years |  |  |  |  |  | 8 years 6 months |  |  |  |  |
Aggregate Intrinsic Value, Exercisable |  | $ 85,863,473 |  |  |  | $ 85,863,473 |  |  |  |  |
Performance Vested Stock Options | 2014 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for award |  |  |  |  |  | 158,550 |  |  |  |  |
Stock-based compensation activity (in shares) |  |  |  |  |  | 529,387 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercised |  |  |  |  |  | $ 316.35 |  |  |  |  |
Number of Options Exercisable at end of period |  | 2,892,840 |  |  |  | 2,892,840 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercisable |  | $ 390.75 |  |  |  | $ 390.75 |  |  |  |  |
Weighted-Average Remaining Contractual Term, Exercisable, years |  |  |  |  |  | 4 years 6 months |  |  |  |  |
Aggregate Intrinsic Value, Exercisable |  | $ 2,998,078,391 |  |  |  | $ 2,998,078,391 |  |  |  |  |
Performance Vested Stock Options | 2006 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for award |  |  |  |  |  | 0 |  |  |  |  |
Stock-based compensation activity (in shares) |  |  |  |  |  | 375,977 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercised |  |  |  |  |  | $ 199.71 |  |  |  |  |
Number of Options Exercisable at end of period |  | 74,215 |  |  |  | 74,215 |  |  |  |  |
Weighted-Average Exercise Price Per Option, Exercisable |  | $ 226.34 |  |  |  | $ 226.34 |  |  |  |  |
Weighted-Average Remaining Contractual Term, Exercisable, years |  |  |  |  |  | 1 year 1 month 6 days |  |  |  |  |
Aggregate Intrinsic Value, Exercisable |  | $ 89,116,630 |  |  |  | $ 89,116,630 |  |  |  |  |
Restricted Stock Units (RSUs) | 2006 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  |  |  |  |  |  |  |  |  | 0 |

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